code: def __call__(cls, *args, **kwargs):
      if cls not in cls._instances:
          cls._instances[cls] = super(Singleton, cls).__call__(
              *args, **kwargs
          )
      return cls._instances[cls]
  
file_path: SerpentAI/serpent/utilities.py
imports: import sys
  import subprocess
  import socket
  import time
  import enum
label_desc: Use image node_id 1 for calling the Singleton obj's underlying member method code with example usage: obj.__call__(cls) and returns: cls